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<!DOCTYPE html>
<html>
<head>
<title>Consistent zoomable Heat Map - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to create a heat map where the radius of each data point covers the same physical area on the ground and creates a more consistent user experience when zooming the map." />
<meta name="keywords" content="map, gis, API, SDK, heatmap, heat map, heatmaps, heat maps, density, layer, thermatic" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-73.963, 40.741],
zoom: 12,
view: 'Auto',
//Add your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
authOptions: {
authType: 'subscriptionKey',
subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Load a data set of points, in this case some sample point of interest data.
datasource.importDataFromUrl('/Common/data/geojson/SamplePoiDataSet.json');
//Create a heatmap and add it to the map.
map.layers.add(new atlas.layer.HeatMapLayer(datasource, null, {
radius: [
'interpolate',
['exponential', 2],
['zoom'],
//For all zoom levels 10 or lower, set the radius to 2 pixels.
10, 2,
//Between zoom level 10 and 22, exponentially scale the radius from 2 pixels to 50000 pixels.
22, 50000
]
}), 'labels');
});
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Consistent zoomable Heat Map</legend>
This sample shows how to create a heat map where the radius of each data point covers the same
physical area on the ground and creates a more consistent user experience when zooming the map.
In this sample, the heat map will scale consistently between zoom levels 10 and 22.
Each zoom level of the map has twice as many pixels vertically and horizontally as the previous zoom level,
as such, scaling the radius such that it doubles with each zoom level will create a heat map that looks consistent on
all zoom levels. This can be accomplished by using the zoom with a base 2 exponential interpolation expression as shown below.
</fieldset>
</body>
</html>
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